/**
 * @file
 * Ping sender module
 *
 */

/*
 * Redistribution and use in source and binary forms, with or without
 *modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 *EVENT
 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 *PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 *ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * This file is part of the lwIP TCP/IP stack.
 *
 */

/**
 * This is an example of a "ping" sender (with raw API and socket API).
 * It can be used as a start point to maintain opened a network connection, or
 * like a network "watchdog" for your device.
 *
 */

/*
 * copyright (c) 2010 - 2011 Espressif System
 */

#include "lwip/opt.h"

#if LWIP_RAW /* don't build if not configured for use in lwipopts.h */

#include "lwip/mem.h"
#include "lwip/raw.h"
#include "lwip/icmp.h"
#include "lwip/netif.h"
#include "lwip/sys.h"
#include "lwip/timers.h"
#include "lwip/inet_chksum.h"
#include "os_type.h"
#include "osapi.h"

#include "lwip/app/ping.h"

#if PING_USE_SOCKETS
#include "lwip/sockets.h"
#include "lwip/inet.h"
#endif /* PING_USE_SOCKETS */

#ifdef MEMLEAK_DEBUG
static const char mem_debug_file[] ICACHE_RODATA_ATTR = __FILE__;
#endif

/* ping variables */
static u16_t ping_seq_num = 0;
static u32_t ping_time;

static void ICACHE_FLASH_ATTR ping_timeout(void *arg) {
  struct ping_msg *pingmsg = (struct ping_msg *) arg;
  pingmsg->timeout_count++;
  if (pingmsg->ping_opt->recv_function == NULL) {
    os_printf("ping timeout\n");
  } else {
    struct ping_resp pingresp;
    os_bzero(&pingresp, sizeof(struct ping_resp));
    pingresp.ping_err = -1;
    pingmsg->ping_opt->recv_function(pingmsg->ping_opt, (void *) &pingresp);
  }
}

/** Prepare a echo ICMP request */
static void ICACHE_FLASH_ATTR
ping_prepare_echo(struct icmp_echo_hdr *iecho, u16_t len) {
  size_t i = 0;
  size_t data_len = len - sizeof(struct icmp_echo_hdr);

  ICMPH_TYPE_SET(iecho, ICMP_ECHO);
  ICMPH_CODE_SET(iecho, 0);
  iecho->chksum = 0;
  iecho->id = PING_ID;
  ++ping_seq_num;
  if (ping_seq_num == 0x7fff) ping_seq_num = 0;

  iecho->seqno = htons(ping_seq_num);

  /* fill the additional data buffer with some data */
  for (i = 0; i < data_len; i++) {
    ((char *) iecho)[sizeof(struct icmp_echo_hdr) + i] = (char) i;
  }

  iecho->chksum = inet_chksum(iecho, len);
}

static void ICACHE_FLASH_ATTR
ping_prepare_er(struct icmp_echo_hdr *iecho, u16_t len) {
  ICMPH_TYPE_SET(iecho, ICMP_ER);
  ICMPH_CODE_SET(iecho, 0);
  iecho->chksum = 0;

  iecho->chksum = inet_chksum(iecho, len);
}

/* Ping using the raw ip */
static u8_t ICACHE_FLASH_ATTR
ping_recv(void *arg, struct raw_pcb *pcb, struct pbuf *p, ip_addr_t *addr) {
  struct icmp_echo_hdr *iecho = NULL;
  static u16_t seqno = 0;
  struct ping_msg *pingmsg = (struct ping_msg *) arg;

  LWIP_UNUSED_ARG(arg);
  LWIP_UNUSED_ARG(pcb);
  LWIP_UNUSED_ARG(addr);
  LWIP_ASSERT("p != NULL", p != NULL);

  if (pbuf_header(p, -PBUF_IP_HLEN) == 0) {
    iecho = (struct icmp_echo_hdr *) p->payload;

    if ((iecho->id == PING_ID) && (iecho->seqno == htons(ping_seq_num)) &&
        iecho->type == ICMP_ER) {
      LWIP_DEBUGF(PING_DEBUG, ("ping: recv "));
      ip_addr_debug_print(PING_DEBUG, addr);
      LWIP_DEBUGF(PING_DEBUG, (" %" U32_F " ms\n", (sys_now() - ping_time)));
      if (iecho->seqno != seqno) {
        /* do some ping result processing */
        {
          struct ip_hdr *iphdr = NULL;
          char ipaddrstr[16];
          ip_addr_t source_ip;
          sys_untimeout(ping_timeout, pingmsg);
          os_bzero(&source_ip, sizeof(ip_addr_t));
          os_bzero(ipaddrstr, sizeof(ipaddrstr));
          uint32 delay = system_relative_time(pingmsg->ping_sent);
          delay /= PING_COARSE;
          iphdr = (struct ip_hdr *) ((u8 *) iecho - PBUF_IP_HLEN);
          source_ip.addr = iphdr->src.addr;
          ipaddr_ntoa_r(&source_ip, ipaddrstr, sizeof(ipaddrstr));
          if (pingmsg->ping_opt->recv_function == NULL) {
            os_printf("recv %s: byte = %d, time = %d ms, seq = %d\n", ipaddrstr,
                      PING_DATA_SIZE, delay, ntohs(iecho->seqno));
          } else {
            struct ping_resp pingresp;
            os_bzero(&pingresp, sizeof(struct ping_resp));
            pingresp.bytes = PING_DATA_SIZE;
            pingresp.resp_time = delay;
            pingresp.seqno = ntohs(iecho->seqno);
            pingresp.ping_err = 0;
            pingmsg->ping_opt->recv_function(pingmsg->ping_opt,
                                             (void *) &pingresp);
          }
        }
        seqno = iecho->seqno;
      }

      PING_RESULT(1);
      pbuf_free(p);
      return 1; /* eat the packet */
    }
    //    } else if(iecho->type == ICMP_ECHO){
    //        struct pbuf *q = NULL;
    //        os_printf("receive ping request:seq=%d\n", ntohs(iecho->seqno));
    //        q = pbuf_alloc(PBUF_IP, (u16_t)p->tot_len, PBUF_RAM);
    //        if (q!=NULL) {
    //            pbuf_copy(q, p);
    //            iecho = (struct icmp_echo_hdr *)q->payload;
    //            ping_prepare_er(iecho, q->tot_len);
    //            raw_sendto(pcb, q, addr);
    //            pbuf_free(q);
    //        }
    //        pbuf_free(p);
    //        return 1;
    //    }
  }

  return 0; /* don't eat the packet */
}

static void ICACHE_FLASH_ATTR ping_send(struct raw_pcb *raw, ip_addr_t *addr) {
  struct pbuf *p = NULL;
  struct icmp_echo_hdr *iecho = NULL;
  size_t ping_size = sizeof(struct icmp_echo_hdr) + PING_DATA_SIZE;

  LWIP_DEBUGF(PING_DEBUG, ("ping: send "));
  ip_addr_debug_print(PING_DEBUG, addr);
  LWIP_DEBUGF(PING_DEBUG, ("\n"));
  LWIP_ASSERT("ping_size <= 0xffff", ping_size <= 0xffff);

  p = pbuf_alloc(PBUF_IP, (u16_t) ping_size, PBUF_RAM);
  if (!p) {
    return;
  }
  if ((p->len == p->tot_len) && (p->next == NULL)) {
    iecho = (struct icmp_echo_hdr *) p->payload;

    ping_prepare_echo(iecho, (u16_t) ping_size);

    raw_sendto(raw, p, addr);
    ping_time = sys_now();
  }
  pbuf_free(p);
}

static void ICACHE_FLASH_ATTR ping_coarse_tmr(void *arg) {
  struct ping_msg *pingmsg = (struct ping_msg *) arg;
  struct ping_option *ping_opt = NULL;
  struct ping_resp pingresp;
  ip_addr_t ping_target;

  LWIP_ASSERT("ping_timeout: no pcb given!", pingmsg != NULL);
  ping_target.addr = pingmsg->ping_opt->ip;
  ping_opt = pingmsg->ping_opt;
  if (--pingmsg->sent_count != 0) {
    pingmsg->ping_sent = system_get_time();
    ping_send(pingmsg->ping_pcb, &ping_target);

    sys_timeout(PING_TIMEOUT_MS, ping_timeout, pingmsg);
    sys_timeout(pingmsg->coarse_time, ping_coarse_tmr, pingmsg);
  } else {
    uint32 delay = system_relative_time(pingmsg->ping_start);
    delay /= PING_COARSE;
    //		ping_seq_num = 0;
    if (ping_opt->sent_function == NULL) {
      os_printf("ping %d, timeout %d, total payload %d bytes, %d ms\n",
                pingmsg->max_count, pingmsg->timeout_count,
                PING_DATA_SIZE * (pingmsg->max_count - pingmsg->timeout_count),
                delay);
    } else {
      os_bzero(&pingresp, sizeof(struct ping_resp));
      pingresp.total_count = pingmsg->max_count;
      pingresp.timeout_count = pingmsg->timeout_count;
      pingresp.total_bytes =
          PING_DATA_SIZE * (pingmsg->max_count - pingmsg->timeout_count);
      pingresp.total_time = delay;
      pingresp.ping_err = 0;
    }
    sys_untimeout(ping_coarse_tmr, pingmsg);
    raw_remove(pingmsg->ping_pcb);
    os_free(pingmsg);
    if (ping_opt->sent_function != NULL)
      ping_opt->sent_function(ping_opt, (uint8 *) &pingresp);
  }
}

static bool ICACHE_FLASH_ATTR ping_raw_init(struct ping_msg *pingmsg) {
  if (pingmsg == NULL) return false;

  ip_addr_t ping_target;
  pingmsg->ping_pcb = raw_new(IP_PROTO_ICMP);
  LWIP_ASSERT("ping_pcb != NULL", pingmsg->ping_pcb != NULL);

  raw_recv(pingmsg->ping_pcb, ping_recv, pingmsg);
  raw_bind(pingmsg->ping_pcb, IP_ADDR_ANY);

  ping_target.addr = pingmsg->ping_opt->ip;
  pingmsg->ping_sent = system_get_time();
  ping_send(pingmsg->ping_pcb, &ping_target);

  sys_timeout(PING_TIMEOUT_MS, ping_timeout, pingmsg);
  sys_timeout(pingmsg->coarse_time, ping_coarse_tmr, pingmsg);
  return true;
}

bool ICACHE_FLASH_ATTR ping_start(struct ping_option *ping_opt) {
  struct ping_msg *pingmsg = NULL;
  pingmsg = (struct ping_msg *) os_zalloc(sizeof(struct ping_msg));
  if (pingmsg == NULL || ping_opt == NULL) return false;

  pingmsg->ping_opt = ping_opt;
  if (ping_opt->count != 0)
    pingmsg->max_count = ping_opt->count;
  else
    pingmsg->max_count = DEFAULT_PING_MAX_COUNT;

  if (ping_opt->coarse_time != 0)
    pingmsg->coarse_time = ping_opt->coarse_time * PING_COARSE;
  else
    pingmsg->coarse_time = PING_COARSE;

  pingmsg->ping_start = system_get_time();
  pingmsg->sent_count = pingmsg->max_count;
  return ping_raw_init(pingmsg);
}

bool ICACHE_FLASH_ATTR
ping_regist_recv(struct ping_option *ping_opt, ping_recv_function ping_recv) {
  if (ping_opt == NULL) return false;

  ping_opt->recv_function = ping_recv;
  return true;
}

bool ICACHE_FLASH_ATTR
ping_regist_sent(struct ping_option *ping_opt, ping_sent_function ping_sent) {
  if (ping_opt == NULL) return false;

  ping_opt->sent_function = ping_sent;
  return true;
}

#endif /* LWIP_RAW */
